The Bob's Machine Setback bracket repositions the outbaord motor into cleaner water to increase propeller efficiency and minimize prop slippage. Drag is reduced and the boat exhibits more bow lift, which results in a drier ride. The increased distance between the propeller and the hull also improves boat operation in reverse. Bob's Machine Shop's fixed setback brackets are made of one-half inch, heavy-duty 6061 T6 aircraft-grade aluminum and can handle up to 300-hp engines. They have the same industrial design and appearance as Bob's Machine's hydraulic jackplates to give an overall look and feel of consistency. Limited lifetime warranty.